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1. Barthawal, R.R. (1998), Industrial Economics, New age int. LtdPublisher, New Delhi.
2. Clark, R. (1990), Industrial Economics, Basil Blackwell Ltd, Oxford.3. Fedderke, J., Szalontai, G. (2009), Industry concentration in South
African manufacturing industry: Trends and Consequences, 1972–96, Economic Modelling, Volume 26, Issue 1, pp 241-250.
4. Hrazdil K. , Zhang, R. (2012), The Importance of IndustryClassification in Estimating Concentration Ratios, EconomicsLetters, Volume 114, Issue 2, pp 224–227.
5. Jacquemin, A. (1987), The New Industrial Organization; MarketForces and Strategic Behavior, Cambridge, The MIT Press.
6. Maddala, G.S, Dobson. S., Miller, E. (1995), Microeconomics, TheRegulation of Monopoly, Chapter.10, Press Mc Grawhill BookCompany, pp 189-195.
7. Parkin, M (2000), Economics, Addison Wesely Pub, USA.8. Sys, C. (2009), Is the Container Liner Shipping Industry an
Oligopoly?, Transport Policy, Volume 16, Issue 5, PP 259-270.9. Yiping, L. and., Hitoshi, I. (2010), Modified Herfindahl–Hirschman
Index for Measuring the Concentration Degree of Container PortSystems, Transportation Research Record: Journal of theTransportation Research Board, 10-3102, pp 44-53.
10. www.irancement.com11. www.cementechnology.ir